Mixer screws

Fig. 37. Various mixer types for dry soflds (a) the V-mixer, (b) ribbon blender, (c) vertical screw mixer, and (d) Nautamix.

Single-Screw Mixers Because of the growth of the plastics indiisti v, use of extruders such as that depicted in Fig, 18-47 are now... 

Trough-and-Screw Mixers These mixers usually consist of single or twin rotors which continually turn the feed material over as it... 

Another type of trough-and-screw mixer with a large volume available for mixing is the AP Conti (List AG) machine shown in Fig. 18-53. These self-cleaning-type mixers are particularly appropriate when... 

There are two primary types of mixers propeller/paddle and screw. Screw mixers can be further divided into two types batch and mixer-extruder. 

The screw mixer uses a single- or dual-screw arrangement to mix liquids, solids, or a combination of both. It comes... 

Figure 38.4 illustrates a typical batch-type screw mixer. This unit consists of a mixing drum or cylinder, a single-or dual-screw mixer, and a power supply. 

Both propeller and screw mixers have specific setup requirements. In the case of propeller/paddle-type... 

After homogenization with the home-made screw mixer the raw slurry gets through a CSN-600 slurry pump 5-6 times daily into the digester through a counterflow heat... 

Mixing time characteristic of the Nauta cone and screw mixer... 

Granulation Techniques Involving Use of Screw Mixer-Extruders. . . 168... 

Investigations conducted in 1975-1985 with a view to designing basic production facilities for granulation of thermosetting plastics concern primarily with improvements relating to plate granulators, screw mixers and rolls. 

In double-screw mixers, the screws normally rotate in one direction at the same speed, an advantage ensuring a high rotational speed and increasing a shearing force and the output of the entire machine. 

A ZSK-type double-screw mixer proposed by Werner Pfleiderer (Table 3)28) adapted to manufacture solidified moulding compounds. 

Table 3. Specifications of Werner Pfleiderer Double-Screw Mixers manufactured in FRG...

Table 4. Buss Screw Mixer-Extruders manufactured in Switzerland...

The Baker-Perkins double-screw mixer-extruders manufactured in the USA and Great Britain are employed for processing thermosetting materials, more specifically, urea-formaldehyde compounds. Basic specifications of these units are given in Table 5 26). 

Table 5. Bakter Perkins Double-Screw Mixer-Extruders manufactured in the USA and Great Britain. Basic Specifications...

The granulating technology involving the use of screw mixers have not hitherto found wide applications in the USSR due to lack of high-quality facilities in the related field. 

Standard production lines for obtaining granulated aminoplast by the use of screw mixer-extruders are shown in Fig. 14a, b. The production line illustrated in Fig. 14a is the Buss line for obtaining crushed material35 ... 

Such techniques include granulation by the use of screw mixer-granulators and granulation by pelletizing by the use of plate granulators. 

Granulation with screw mixer-granulators requires fairly simple equipment. However, stringent requirements are placed on source material, as regards increased duration of a viscous-flow state at moulding temperatures and the need to rigidly maintain predetermined temperature conditions in all zones of the operating equipment. 

Fig. 1. ASPEN-Plus PFD of carbonic acid pretreatment process as analyzed in this study. Bl, pretreatment reactor (Rstoic) B2, screw mixer B3, blowdown tank and screw conveyor B4, slurrying tank and tank agitator B5, cooler B6, reflux drum and condenser B7, feed pump B8, in-line C02 mixer B9, heater BIO, pneumapress filter Bll, heat exchanger B12, loading pump B13, C02 compressor B14, primary filtrate pump.

This patent contains a description of a screw mixer with eccentric, triple-flighted spirals. 

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